Fast red flashing, but charged...?

I read the “how to interpret V5 battery errors” document located here: https://help.vex.com/article/142-how-to-interpret-error-messages-with-the-v5-battery

One of our goes from 75% charged to one red, fast flash, indicating that it has low voltage and needs a charge. However, it doesn’t indicate a bad cell.

(I have video if it helps where pushing the button shows the charge, but still flashes). Plugged into the charger, it … charges from 75% up, but again, fails quickly after use. [This bit the team hard yesterday in a tournament match].

How should I interpret this combo? (@jpearman)

Can you link me to the video? It could be faulty firmware.

sounds like a bad cell. Have a look in the brain log and see of there are any battery related messages. Run the battery diagnostics program and see what that shows.

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